Air accumulator



June 112, 1923.

1194582099 F. KEMPTER AIR AGCUMULATOR Filed Oct. 8, 1920 INVENTOR:

Patented June 12, 1923.

air ares 'rR-I'rz' KEMPTER, or s'ror'rean'r, GERMANY.

AIR ACCUMULATOR.

Application filed October 8, 1820. Serial No. 415,690.

To allwhom it may concern:

Be it known that I, FRITZ Knirr'rnn, a citizen of the German Empire, residing at Stuttgart, Germany, have invented certain new and useful Improvements in Air Accumulators, of which the following is a specification.

My invention relates to air accumulators and its'particular object is an automatic starting and stopping device for such accumulators. In accumulators of this kind having a piston interposed and separating the compressed air from the pressure fluid, the control devices serving to automatically govern the supply of the pressure fluid were hitherto operated either by means of compressed air with the separating piston freely suspended between this latter and the pressure fluid, in that the fluctuations of pressure provoked by the reciprocating motion of said piston were caused to act on an electrical contact manometer which then in turn affected the respective devices, or by means of a rigid connection of the separating piston with a piston rod passing either through the cover or the bottom of the accumulator cylinder, such rod equalling in length the piston stroke, and Which set the respective devices in operation.

N ow these aforesaid two control arrange. ments embody numerous drawbacks.

Thus in the first case there prevails the disadvantage that along with the unavoidable loss of compressed air during service in consequence of leakage, the tension of said air comes to be altered and that in connection herewith the upper and lower terminal position of the separating pistonwhich cannot be observedfrom the outside-will undergo a corresponding change on the contact manometer effecting the reversal which will then give rise to trouble.

In the second case, it is true, the control action is independent of the air pressure, but in return the guide rod articulated to the separating piston increases the height of the accumulator structure, while the stufiin box throiwh which the iston rod g a a P has to be passed either in the cover or the bottom of the accumulator cylinder, is exposed to much wear and consequently liable to frequent leakage, as the piston-rod is obliged to take part in even the slightest motion executed by the separating piston.

It is an object of my invention to obviate these drawbacks by the reversal being carried out generically speaking and indeed even as in the second case, by the separating piston, while at the same time omitting the long piston-rod hitherto required to this end and yet retaining the arrangement according to which the separating piston is freely suspended between the parts. In the place of the piston-rod, there is arranged either in the top or thebottom of the accumulator cylinder, a short rod, the length of which does not correspond to the extent of the piston stroke but merely" to the magnitude of the controlv motion, said rod being acted on by the piston only periodically, i. e. only then, when the piston almost comes to assume its extreme posit1on, while the rod is completely motion less for as long as the separating piston happens to be in the opposite portionuof the accumulator-cylinder.

In the drawings affixed to this specification and forming part thereof, two accumulators embodying my invention are illustrated by way of example. In the drawings Fig. 1 is a vertical section through an accumulator, showing the control means.

Fig. 2 a similar view of a modified form,

Fig. 3 a cross sectional view of the construction according to Fig. 1, and

Fig. 4; 1s a cross-section of the valve connected with the accumulator shown in Figs 1, and 3.

Referring to rod 1, extending into the accumulator cylinder, is adapted to support the weight 5 suspended to the cross member 2 by the intervention of the rods 3 and 4. At its lowermost end the rod 3 supports the arm 6 adapted to slide along the rod 9 provided, for its part, with an adjusting collar 7. This rod 9 is articulated to the lever 10 of the by-pass valve 22. The lever 10 places itself above the casing 11 of valve; its fulcrum is indicated at 12, and it lifts the valve 22 from its seat 21 as soon as therod 9 is raised. lVhenever this is the case, the pawl 13 lodges itself underneath lever 10 and thereby secures it in its position. On the other hand, as soon as the weight 5 assumes its lowermost position, the pin 14 arranged on arm 6 strikes against the arm 15 of the lever and by these means releases- Fig. 1 of the drawings 1 either side of the valve casing," serve, re-

der through pipe .19 and escapes through r 7 Hon rod 9 and draws this latter upward.

pipe against the rod.1,-it takes this latter along while continuing to rise until the arm 3. of IO'Lll 3'v comes tov abut against thecollar By. these means, the lever 10 in turn is lifted and secured :in its raised position by the interposition of the pawl 13'. The lever l0 being raised, the biy-pass valve 22 comes toibe opened so that now: the action of the pressure pump is annihilated, that is to say,

the pressure fluid is no longer fed into the, accumulator but returned WVlthOLli) pressure to the pump barrel. At the same t1-me,'the

accumulator is completely charged. It now pressure fluid be withdrawn from the accumulator,-then the separating piston and with it the weight :5 will drop, valve 22::tor the present remaining unaffected. No sooner,

however, doesithepin 1d arran'gedon arm. 6:.after efl'ectlng. a certain .lost :n1ot1on- 5 come'to attain the leverllowhen, andasthe movement continues, the: pawl 13 isv released and therewith .valve 22 disengaged so that I it may now, ClOSe,.:WhGlQHpOD the pump again C0IHI11G11GGS11tO feed the accumulator. The

" afor said idleqmotion, which maybe regulated at pleasure, is in so far of great importancesas it will serve, for example in the lease of. .by-pass of thewkind specified, to.

I prevent any liability on. the part of these latter to pound, :WlllCll ,Lmight otherwise be sition.

apt to 000111 1W118l6 the supply and. consumption ofythepressure, fluid :areapproximattely the; ,asfame land where. the "separating piston tends to oscillate when in its uppermostv'po- 21E Will'thusbe seen that by meansv oi the improved construction there is produced a self-acting device adapted ato cut off the pressure fluid supply of the accumulator by theaforesaid orany other suitable means,

andzthenragain tqopen. he supply and this eithersooner or later according to the, position assumed by the piston within the working cylinder and the lengthof rod-,1. I

In the modified form disclosed by ,Fig. 2, thepressurefluid is locatedbeneatlr and th'eacompressedan above the piston, while, the cylinder is, lodged on araisedpedestal in whioh' the bypass valve 11 is arranged.

, This valve-protrudes by means of an exten I sion4 ,101 passing through the cylinder pump barrel. closed, the connection cover into thecylinderand is .kept. closed by the intervention} of a spring 18. "Thefeed pipe 16 serves to establish communication between the pump and the accumulator, While pipe 17'serv'es for the return to the On the by-pass valve being established by pipes ltiand 17 is cut.- v

As soon as the piston depresses the rod 1, the saidvalve is opened, pipes 16 and 17 enter into action again, and the fluid supplied by the pump is again caused to flow back into the pump barrel.

By suitable provision,-the adjustable lost motion described in connection with the construction according to Fig. 1, may also. be introduced into the modified construction. according toFig. 2. I

I claim:

1.'In1a device of the kinddescribed .in combination, a cylinder closed. at both. ends, a rodeless 'piston freely movable within 3 said cylinder, means comprising a valve tor-introducing a pressure liquid at one end of;

said cylinder and .a rod operatively connected with said valve projecting into said cylinder so as to be acted :uponiwby said pistonat one end of its stroke.

2.. In a device of theZkinddesoribed in combination, a cylinder closedat both ends, a piston freely-movable :withinsaid cylinder, means comprising a :valve for introducing a pressure liqui'diat one end of said cylinder, a rod projecting: into the other-end. otsaid' cylinder so as to be actedupon by said piston at the end of its stroke and a-connection between said rodv andsaid valve'. -adap.t-. ed to cause said valve to be reversedvupon the rodhaving been displaced .a certain'dis, tance by said piston.

3. In a device of the @kind described combination, .a cylinder closed atboth ends, a piston freelyflmovableiwithin said cylinder, means comprising a valve for introducing a pressureliquidatone end or said cylinder, a rodprojecting into: the other end. of said cylinder so as to' be acted upon by said piston at the end of-its stroke, asecondvrod connected with said first rod andadapted tomove into' operative contact with said valve, a weighted 'lever for 'lockingsaid valve in a certain working condition and means, adapted to. be actuated by said-second rod on thefirst Bod-having beendisplaced a certain distance-bysaidpiston, for release ingsaid locking, lever.

In testimonywhereof I; ailixmy signature. 7

' ERICELKEMPTEB. 

